1. The Kyoto Protocol, United Nations Framework Convention on Climate Change, COP 3, Kyoto, Japan, December 11, 1997.
2. Annual European Community greenhouse gas inventory 1990–2001 and inventory report 2003. Technical Report 95, European Environment Agency, 2003.
3. Formation and control of N2O in nitric acid production
4. Draft reference document on Best Available Techniques in the large volume inorganic chemicals, ammonia, acids, and fertilizer industries, European IPPC Bureau, March 2003.